From TibiaWiki

This Helmet is owned by a few players on Antica, one can be found on Lunara and Premia, as they can also be found on several other worlds. The helmet was a spawn that appeared at a map reset in the now Bright Sword Quest undeneath the Outlaw Camp, in the old days. Map resets happened once every 4-6 months back then. This helmet was rare then, and to this day is a priceless item for collectors.